EP1157859B1 - Tyre tread with blocks containing sipes - Google Patents

Tyre tread with blocks containing sipes Download PDF

Info

Publication number
EP1157859B1
EP1157859B1 EP01660093A EP01660093A EP1157859B1 EP 1157859 B1 EP1157859 B1 EP 1157859B1 EP 01660093 A EP01660093 A EP 01660093A EP 01660093 A EP01660093 A EP 01660093A EP 1157859 B1 EP1157859 B1 EP 1157859B1
Authority
EP
European Patent Office
Prior art keywords
slit
slits
webs
type
tread
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP01660093A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1157859A1 (en
Inventor
Pentti Juhani Eromäki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokian Renkaat Oyj
Original Assignee
Nokian Renkaat Oyj
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nokian Renkaat Oyj filed Critical Nokian Renkaat Oyj
Publication of EP1157859A1 publication Critical patent/EP1157859A1/en
Application granted granted Critical
Publication of EP1157859B1 publication Critical patent/EP1157859B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
    • B60C11/1236—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special arrangements in the tread pattern
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
    • B60C11/1204—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe
    • B60C2011/1213—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe sinusoidal or zigzag at the tread surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
    • B60C11/1236—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special arrangements in the tread pattern
    • B60C2011/1245—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special arrangements in the tread pattern being arranged in crossing relation, e.g. sipe mesh
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
    • B60C11/1236—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special arrangements in the tread pattern
    • B60C2011/1254—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special arrangements in the tread pattern with closed sipe, i.e. not extending to a groove
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S152/00—Resilient tires and wheels
    • Y10S152/03—Slits in threads

Definitions

  • the present invention relates to pattern blocks in the tread of a tyre, comprising a tread layer of one or several rubber materials on the texture of the tyre, and pattern blocks separated from each other by wider grooves in this said tread layer, and fine grooves substantially narrower than the said grooves at least in part of these pattern blocks, each of the fine grooves comprising at least one bend or at least one end within the area of the pattern block.
  • slits typically very narrow, differently shaped slits, which are also called fine grooves, capillary slits, or lamellae, are used in the patterning of the tread of tyres in cars, delivery vans and trucks as well as other similar vehicles, which are meant to be used in winter conditions and which thus have to have a good grip both on ice, in snow and in slush.
  • the internal slits in the pattern segments are so narrow that the sections of the pattern segment on two sides affect each other during driving.
  • Such slits have been described, for example, in the publications EP-0 881 103 A1 and EP-0 125 437 A1, in which it is suggested that long bending slits be used, the shape of the slits being different at different places of the tread thickness.
  • the purpose of the first publication is to make it possible to provide the pattern segments with a large number of slits and to retain the number and length of these slits also as the tyre wears during use.
  • the shaping of the slits is meant to prevent the tearing of the webs between adjacent slits, which may be caused by deformations in the pattern segments during the use of the tyre.
  • the publication DE-25 49 668 discloses short hook-shaped slits which are arranged in different positions and which do not extend to the grooves between the pattern blocks, but which are found entirely inside the pattern blocks.
  • the publication DE-2 253 717 discloses also hook-shaped, and additionally V-shaped and zigzag-shaped relatively short slits, of which only one is found in each pattern block according to some applications indicated in the figures of the publication; according to some other applications, several such slits may be included in one pattern block so that they are arranged in line in accordance with the principal direction of the slits or in line transverse to the principal direction of the slits.
  • the several slits in the same pattern block are generally placed at a relatively long distance from each other especially when the line direction of the slits is transverse to the principal direction of the single slits.
  • the slits in the same pattern block are arranged as extensions to each other so that the slits are not in the least overlapping, but their ends are rather close to each other.
  • the influence of the shapes and positions of the slits is not disclosed in the publication, but according to the publication it is essential that the surface pattern contains sections in the circumferential direction of the tyre that differ from each other in relation to the number of the surface profile units and grooves per area unit and/or contour shapes and/or size and/or arrangement.
  • Both the treads according to the publication DE-25 49 668 and the publication DE-2 253 717 contain very few of these slits, i.e. fine grooves, and the suggested surface patterns of the tread do not provide anywhere near the sufficient grip properties according to the present level of requirements.
  • the object of the invention is to provide such a tread for the vehicle tyre, which provides the tyre with good grip on a road surface with ice, slush, or snow, and which retains these grip properties as well as possible also as the tyre wears out, i.e. the tread becomes thinner.
  • the second object of the invention is to provide such a tread, also the other driving properties of which are good both as new, i.e. unworn, and as worn, even if the rubber material used for the tread were relatively soft, i.e. flexible rubber material.
  • each pattern block can be provided with the desired big or relatively big number of slits so that the grip of the tyre can be made excellent, but however so that the sections of the pattern block separated from each other by slits in an unworn tread are kept sufficiently strongly or rigidly together, thus making the driving behaviour of even a new tyre excellent and not too yielding, for example, in the changes of the driving direction, i.e. the tyre is not "sluggish", even as new.
  • Another advantage of the invention is that, as the tyre wears down, for example, the effective number of slits remains at least almost unchanged, i.e.
  • the number or the effective length of the slits is not reduced decidedly or to a harmful extent, so that the grip properties remain good in snow, slush, and on ice.
  • This also provides the tread with a roughening or pilling property continuing substantially until the end of the operating life of the tyre so that points projecting into the small inequalities of the road surface and thus increasing the grip are generated onto the tread.
  • the vehicle tyres filled with air comprise, among others, the carcass 25, which nowadays typically contains a radial texture in the area of the tread, and on top of the carcass a tread layer 20 manufactured of one or several rubber materials.
  • This tread layer 20 comprises pattern blocks 1 separated from each other by wider grooves 21, and at least in part of these pattern blocks fine slits 2 or capillary slits or fine grooves or lamellae (the terminology is not completely established) or simply just grooves 2, which are essentially narrower than the said grooves, each of the slits comprising at least one bend 5 or at least one end 4 within the area A1 of the pattern block.
  • the grooves 21, the pattern blocks 1 and the slits 2 form together with possible circumferential ribs 17 the surface pattern of the tread.
  • the tread grooves 21 refer to grooves, the groove depth H3 of which is sufficiently large and the groove width W4 so large that the side edges 19 of the adjacent pattern blocks 1 separated from each other by the groove do not at least to a substantial extent contact each other during the use of the vehicle tyre, i.e. during driving, even during a change in speed and/or direction.
  • the pattern blocks do not rest on each other more when the tyre is stationary than during accelerations, decelerations or changes in direction, but the pattern blocks can elastically deform at least generally independently, irrespective of the other pattern blocks and their deformation.
  • the groove width W4 of the grooves 21 is generally at least 5 mm or more, when vehicle tyres, especially tyres for cars or delivery vans or trucks are concerned.
  • the slit width W2 of these slits being designed so small that the different sections of the same pattern block on the opposite sides of the slit 2 rest on each other during a change in speed and/or direction.
  • the opposite sides 16a and 16b of each slit 2 in the pattern block 1 come into contact with each other from a smaller or wider area at least during accelerations or decelerations or changes in direction, and thus the sections in the pattern block separated by the slit/slits, in the tread of the invention the nubs 8, support each other in driving situations including changes.
  • the nubs 8 in the tread on two sides of the slit 2 recline in relation to the circumferential surface of the tyre in rest condition, and their outer surfaces 22 form the zigzag-shaped or wavelike form, seen in Fig. 10, thus offering improved grip points to the base, which furthers the grip of the tyre.
  • the slit width W2 of the slits 2 is typically at least about 0.1 mm or at most about 1.5 mm, such as 0.3 mm - 0.8 mm, although even smaller or, for example in truck tyres, wider slits are possible.
  • the possible slit width W2 is influenced by the thickness of the tread, or in other words, the slit depth H3 so that in a tyre with a bigger groove depth, wider slits 2 can be used than in a tyre with a smaller groove depth, because the deflection of the pattern block 1 is bigger with the same force, and thus the sides 16a, 16b of the slit become more easily into contact with each other, even if their distance, i.e. the slit width were bigger when the slit depth H3 is big, as compared with a case in which the slit depth would be smaller.
  • the pattern blocks 1 comprises surface tear points 10 between at least two adjacent slits 2.
  • the universal reference number 2 is used for the slit in a case when reference is made to the slit in general, and its features are not defined; the specific reference numbers 2a - 2e are used in a case when reference is made to a slit of a certain type.
  • each surface tear point 10 is developed from webs 3a, 3b between the end 4 of at least one slit 2 and at least one second slit 2 or its end 4.
  • each surface tear point 10 is developed from webs 3c, 3d between the bend of one slit 2 and one second slit 2 or its bend 5.
  • the web width W3 of the said webs 3a-3d in the surface tear points 10 is at most five times the slit width W2 of the slit 2a-2e, and two adjacent slits 2a - 2e further restrict between their mutual webs 3a - 3d within the pattern block 1 nubs 8 with an area A1.
  • the web width W3 refers to the distance between adjacent slits, as can be seen from the Figures.
  • the webs 3a - 3d also have a web thickness P3, which is a measure perpendicular to the web width W3, based on the projection of the slit width W2 of the slit to the level parallel to the web width at that point.
  • the web thickness P3 is approximately equal to the slit width W2; in the embodiments in Figs. 2B and 3 slightly smaller; in the embodiments of Figs. 5B, 6 and 7A about 2 ⁇ W ⁇ 2 / 2 , if in the bends described later, the slits 2b, 2d form a right angle, and in the embodiments in Figs.
  • the web thickness is approximately equal to the web width W3. It is obvious that the values for the web width W3 and web thickness P3 deviate from the ones told, in a case in which the shape of the slits 2 deviates from the ones shown in the Figures, as can be the case according to the invention.
  • the web width W3 and the web thickness P3 are dimensioned according to the rubber material or rubber materials of the tread 20 so that, as the tyre is used during driving, the pier or ridge or web 3a - 3d of the invention tears into a certain depth H1, starting from the respective outer surface 22 of the tread, the tear depth H2 being substantially smaller than the groove depth H3 and the slit depth H2.
  • the tear depth H1 should be at least 0.5 mm and at most 1.5 mm of the outer surface 22 of the tread.
  • the tear depth H1 is near to 1.0 mm, such as 0.8 mm - 1.2 mm. This tearing of the web 3a - 3d can be understood with the help of Figures 9 and 10.
  • a shear stress parallel with the slit depth H2 of the slit 2a - 2e is generated to the web 3a - 3d due to bending, the stress exceeding the tear strength of the rubber material on this restricted area, because of the predetermined relatively small cross section of the web determined by the web width W3 and the web thickness P3.
  • the tread of the tyre contains also upon wearing out, i.e. as the slit depth H3 and the slit depth H2 decrease, a tear of the web 3a - 3d extending generally always to equally big tear depth H1 from the prevailing outer surface, i.e.
  • the web is in fact removed from the outer surface 22 to the depth H1.
  • the deformation of the pattern block 1 is smaller, and the shearing force parallel to the slit is thus considerably lower so that the tear strength of the rubber material is not exceeded, but the web remains unbroken.
  • This configuration of the tread of the invention has the special advantage that the grip properties of the tyre tread are completely or almost identical to those of a tread which would contain continuous and fully open slits and between them tilting or bending rubber sections, such as nubs 8 of the invention, etc.; but simultaneously, also the second advantage is achieved that, in the lower part of the webs, on the dimension H4, the webs further connect the opposite sides 16a and 16b of the slit to each other so that the total rigidity of the pattern block 1 is identical to or at least close to the rigidity of such a pattern block which has no slits, which again reduces the wandering of the tyre during driving.
  • the webs 3a, 3b, 3c, 3d forming the surface tear points thus connect the adjacent nubs 8 to each other from the bottom 23 of the slits 2 towards the outer surface 22 of the tread from the height of the said measure H4, the measure H4 decreasing as the tyre wears out at the same time as also the slit depth H2 decreases. On each wear level of the tyre, the decreasing measure H4 is smaller than the prevailing decreasing slit depth H2.
  • the web width W3 is preferably at most four times the slit width W2, or at most two times the slit width.
  • the tread works in the way referred to above also when the web width W3 of the webs 3a - 3d is substantially equal to the slit width W2.
  • the web thickness P3 of the said webs 3a - 3d again is at most three times the slit width W2 of the slit, or at least half of the slit width.
  • the web width W3 of the webs is at most 1.5 mm and at least 0.3 mm, or the web width is preferably 0.5 mm - 1.0 mm and that, respectively, the web thickness P3 of the webs is at most 1.3 mm and at least 0.2 mm, or preferably 0.4 mm - 0.9 mm.
  • the surface tear points 10 described above are thus provided onto the tread of a tyre by arranging to it points with small cross-dimensions, to which the stresses caused by the deformations of the tread and especially of the pattern blocks 1 during driving are directed.
  • these surface tear points it is advantageous to utilise the ends 4 of the slits 2 and/or bends 5 of the slits 2, as will be described later in connection with certain forms of embodiment.
  • the reference number 5 refers to the bend in general, and the reference numbers 5a and 5b are only used to individualise the special features of the bend. The design of different bend types will be handled in detail later. At present it is believed to be advantageous that each one of the webs 3a, 3c, 3d forming surface tear points 10 is located on the convex side K1 of the bend 5 in question, as is shown in Figures 2B - 2D, 5B - 5C, 7A and 7C.
  • the surface tearing of the invention occurs between the end 4 of the slit or slits 2 and the convex side K 1 of the second slit 2 or the convex side of the bend 5, and likewise between the convex side K1 of the bend 5 of the slit 2 and the convex side K1 of the second slit 2 or the convex side K1 of the bend 5.
  • each one of the webs 3a forming surface tear points 10 is located on the straight section of the second slit or slits or approximately on the straight section; and in the cases of Figures 5A - 5B, 7B - 7D and 8, each one of the webs 3b forming surface tear points 10 are located between the ends 4 of the slits, which also are good alternatives. It is also possible to arrange each one of the webs 3a, 3c, 3d forming surface tear points 10 onto the convex side K2 of the bend 5, as is shown in Figure 7D.
  • each one surface tear point 10 may simultaneously have also several webs 3a and/or 3b and/or 3c and/or 3d of different types.
  • Such a surface tear point 10 consisting of a combination of webs of different types is shown in the rightmost web point in Figure 7A and in Figure 7D.
  • Figures 2A-2D depict solutions of the invention, in which at least two adjacent slits 2 both contain two bends 5, which open substantially to opposite directions in a single slit.
  • Such relatively short, hook-shaped, Z-shaped or S-shaped slits, which do not usually extend across the pattern block between its opposite sides, are here referred to as the slit 2a of the first type.
  • a single slit may naturally extend from its one end to the side 16a or 16b of the groove.
  • such slits 2a of the first type are additionally found two or several interlaced in row 18 in uniform positions, forming webs 3a of the first type so that the principal directions D7 of the intermediate sections 7 between two bends 5 of a slit are either parallel or gradually changing their direction in a fan-shaped manner.
  • the webs 3a of the first type are formed into points, in which the end 4 of one slit 2a meets the bend 5 or an intermediate section 7 of the adjacent slit 2a, i.e. some other point than the end, on the web width W3.
  • the row 18 refers also to the row of nubs 8 in the pattern block 1.
  • the angle of deflection ⁇ may have the angular value of 30°-90°.
  • the row direction D1 is formed of an envelope or direct envelope, which travels through the successive surface tear points 10 corresponding to each other in the row 18, and which is identical to or parallel with the envelope passing through the middle points of successive nubs 8 in the row 18. This determination of the row direction D 1 concerns all row directions mentioned in this specification. In the case of Figures 2A-2D, the envelopes passing through the surface tear points and the middle points of the nubs are united.
  • FIG. 3 there is shown a solution of the invention, in which at least two adjacent slits 2 both contain one bend 5.
  • Such L-shaped or V-shaped relatively short slits which do not usually extend across the pattern block between its opposite sides, are here referred to as the slit 2b of the second type.
  • slits 2b of the second type are found in pairs in the row 18, the slits 2b of the second type being found interlaced in the said slit pairs 11 and forming mirror-like webs 3a of the first type, in which the end 4 of one slit 2b meets the bend 5 or intermediate section 7 of the adjacent slit 2b on the web width W3.
  • the intermediate section 7 may be either curved or bending or, as in Figure 3, straight.
  • Figure 4 presents a solution of the invention, in which at least two adjacent slits 2 both contain two bends 5, which open principally to the same direction in a single slit.
  • Such U-shaped or [-shaped or ⁇ -shaped relatively short slits, which do not usually extend across a pattern block between its opposite sides, are here referred to as the slit 2c of the third type.
  • slits 2c of the third type are arranged alternately interlaced and mirror-like in the row 18, thus forming webs 3a of the first type already defined above.
  • the average directions D7 of the intermediate sections 7 between two bend points are parallel with each other and with the constant row direction D1 of the row.
  • the intermediate section 7 may be either curved or bending or, as in Fig. 4, straight.
  • the envelopes passing through the surface tear points 10 and the middle points of the nubs 8 unite forming the row direction D1.
  • FIGs 5A-5B there is shown a solution of the invention in which at least two adjacent slits 2 both contain one bend 5, so that this concerns the slit 2b of the second type already described earlier.
  • slits 2b of the second type are arranged in pairs in row, the slits 2b in the slit pairs 12 being arranged mirror-like opposed, forming - in a case in which the bends 5 in slit pairs 12 open towards each other, as in Fig. 5A - webs 3b of the second type, and/or - in a case in which the bends 5 in slit pairs 12 open away from each other, as in Fig. 5B - webs 3c of the third type.
  • the webs 3b of the second type are formed as the ends 4 of two slits meet each other on the web width W3
  • the webs 3c of the third type are formed as the bends 5 of two slits meet each other on the web width W3.
  • the slit pairs 12 with their webs 3b or 3c form the row 18, and additionally, the said web width W3 is located between the ends 4 of the slits in the successive slit pairs 12 of the row 18 so that web combinations 9 between the slit pairs, as in Fig. 5B, or webs 3b of the second type, as in Fig. 5A, are generated.
  • two webs 3b of the second type thus meet each other on the web width W3 so that the web combination 9 is in a way a combination of four webs, in which web widths W3 are found at least in two directions transverse or perpendicular to each other.
  • Figure 6 presents a solution of the invention, in which at least two adjacent slits 2 both contain three or several bends 5, which open alternately to substantially opposite directions.
  • Such zigzag-shaped or wavelike relatively long slits are here referred to as the slit 2d of the fourth type.
  • slits 2d of the fourth type are arranged rectilinearly in pairs, the slits in the slit pairs 12 being arranged opposed and mirror-like so that every other of the opposed bends 5 opening away from each other are found at a distance of the web width W3 from each other, forming webs 3c of the third type.
  • the bends 3c of the third type are thus formed between the convex sections of the bends 5, as in Figures 5B, but deviating from this, the slits 2d of the fourth type continue with bends 5 opening to opposite directions.
  • the webs 3c are found in the row 18 corresponding to the principal direction of the slits.
  • Figures 7A-7C there is shown a solution of the invention, in which at least one of two adjacent slits 2 is either the slit 2b of the second type containing one bend point opening towards another slit, as in Figs. 7B and 7C, or the slit 2d of the fourth type containing three or several bend points, opening alternately substantially to opposite directions, as in Fig. 7A; and the other slit 2e of the fifth type is substantially straight and continuous, as in all the Figures 7A-7C.
  • the slit 2e of the fifth type does not need to be linear, but it may be evenly curving, such as a section of a circle, ellipse, parabola, etc., or some other free arched shape; or it may also possibly be wave-form, as long as it is substantially less and more gently bending than the adjacent slit 2b, 2d of the second or fourth type.
  • a slit pair formed by the substantially straight slit 2e of the fifth type and the slit 2b of the second type which has been described earlier, or by a number of slits; or a slit pair formed by the substantially straight slit 2e of the fifth type and the bending slit 2b of the fourth type, which has been described earlier.
  • the ends 4 of the slit or slits 2b of the second type are found at a distance of the web width W3 from the slit 2e of the fifth type, forming webs 3a of the first type, as has been described earlier. If the distance of the successive webs of the first type on the measure of the slit 2e of the fifth type corresponds to the web width, web combinations 9 are formed also in this case, as in Figures 7B and 7D. Secondly, the bends 5 of the slit of the fourth type are found at a distance of the web width W3 from the slit 2e of the fifth type, forming webs 3d of the fourth type.
  • the webs 3d of the fourth type are thus formed as the bends 5 meet the substantially straight slit 2e on the web width. Both the webs of the first type and the webs of the fourth type 3a, 3d form the row 18.
  • the envelopes passing through the surface tear points 10 and the middle points of the nubs 8 do not unite, but they are parallel in relation to each other and to the slit 3e of the fifth type, forming the row direction D1.
  • Figure 8 presents a solution of the invention, in which at least two adjacent slits comprise four principally straight slits 2e of the fifth type.
  • both the slits adjacent to each other consist of the combination of two single slits.
  • the web combination 9 is in a way a combination of four webs in which web widths W3 are found at least in two directions transverse or perpendicular to each other, just as in the surface tear points corresponding to Figure 5A.
  • the first webs 3b 3b 1 of the second type form the row 18.
  • the reference number 3b refers to the web of the second type in general, and the more individualised reference numbers 3b 1 , 3b 2 and 3b 3 refer to webs of the same type in different points only for improving the understandability.
  • each pattern block 1 contains at least one row 18 of surface tearing points 10 formed by the webs 3a-3d, and thus nubs 8 restricted by slits 2 between them.
  • Each row contains at least two nubs 8.
  • the pattern block 1 contains preferably altogether at least five nubs 8.
  • the row direction D1 of the rows 18 determined above is transverse to the circumferential direction Tc of the tyre, and preferably, the row direction forms the row angle K2 between 90° and 45° to the circumferential direction, as can be seen from Figure 1.
  • the nubs have the essential length L1 and width W1 both in the circumferential direction Tc of the tyre and in the lateral direction Tw of the tread. Further, the said nubs 8 are found in pattern blocks in the shoulder areas Ts of the tyre and in pattern blocks in the direction of the middle parts Tm of the tyre from them, such as in the circumferential rib 17 or ribs of the tread, as in the example in Figure 1.
  • the circumferential webs, such as the middle web can naturally be left without the slits 2a-2e of the invention and without the nubs 8 of the invention.
  • the area A2 of each nub is thus substantially smaller than the area A1 of the pattern block 1, for example, one third, one fourth or one fifth, or an even smaller share of the area A1 of the pattern block.
  • the nubs 8 have to be larger than a certain minimum size both from their area and both dimensions perpendicular to each other in the direction of the outer surface 22.
  • the nubs have to be of such a size and shape that the biggest possible circle to be fitted into or drawn onto the outer surface 22 in the area of slits 2 and surface tear points 10 restricting it, i.e.
  • the circle Y found on the area A2 of the nub and touching the slit 2 restricting it at least in three points - if the nub is restricted by substantially straight slits - or at least in two points - if the nub is restricted by substantially curved slits - has an area A3 which is at least 1.7 mm 2 , but preferably at least 3 mm 2 , and typically 5 mm 2 - 12 mm 2 , when tyres of a car are concerned.
  • the minimum size of nubs 8 is about 1.5 times the values for the car tyres, etc., i.e.
  • the area of the maximum-sized circle Y drawn inside the nubs is about double the values for car tyres, i.e.
  • the maximum size of the nub 8, or the area A2 depends on the size of the tyre, being about 40 mm 2 in car tyres, about 60 mm 2 in delivery can tyres, and about 100 mm 2 in truck tyres.
  • the said bend 5 of the slits is the angle 5a
  • its angular value ⁇ i.e. the angular space of the slit sections coming to the angle 5a
  • the angular value ⁇ for the said angle 5a is 80° - 100°.
  • the said bend 5 of the slits 2 is an arc 5b curving with a relatively large radius of curvature, which extends - in cases, in which the arc 5b continues as sections 15a with an unchanged radius of curvature R1 - as a single shape to the first curvature ⁇ 1, the value for which is at least 150° and at most 210°, or preferably 170° - 190°.
  • the arc 5b extends - in cases, in which the arc 5b continues as substantially straight sections 15b - to the second curvature ⁇ 2, the value of which is at least 60° and at most 120°, or preferably 80° - 100°.
  • the arc 5b extends - in cases, in which the arc 5b continues as sections 15c, the radiuses of curvature R2 of which are bigger than the radius of curvature R1 of the said arc 5b - to the third curvature ⁇ 3, the value for which is between the said first and second curvature ⁇ 1, ⁇ 2.
  • the fine grooves or slits 2a and/or 2b and/or 2c and/or 2d and/or 2e may extend to the one edge 19 or to two opposite edges 19 of the pattern block 1 and open into the grooves 21 between the pattern blocks in these points.
  • the surface tear points 10 of the invention and the webs 3a-3d between the slits 2, or capillary slits, or fine grooves, generating these, may be used in treads of vehicle tyres of any type, irrespective of the shapes of the surface pattern.
  • treads of vehicle tyres of any type irrespective of the shapes of the surface pattern.
  • the surface pattern in Figure 1 is only one example, and the invention is not restricted to this.
  • the designs of the slits 2 and the types of the webs may vary within wide ranges and deviate from the ones shown in the Figures.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)
EP01660093A 2000-05-23 2001-05-08 Tyre tread with blocks containing sipes Expired - Lifetime EP1157859B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20001234A FI115833B (fi) 2000-05-23 2000-05-23 Kuviopalat ajoneuvon renkaan kulutuspinnassa
FI20001234 2000-05-23

Publications (2)

Publication Number Publication Date
EP1157859A1 EP1157859A1 (en) 2001-11-28
EP1157859B1 true EP1157859B1 (en) 2006-12-20

Family

ID=8558436

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01660093A Expired - Lifetime EP1157859B1 (en) 2000-05-23 2001-05-08 Tyre tread with blocks containing sipes

Country Status (7)

Country Link
US (1) US6837285B2 (no)
EP (1) EP1157859B1 (no)
JP (1) JP2002002235A (no)
AT (1) ATE348717T1 (no)
DE (1) DE60125276T2 (no)
FI (1) FI115833B (no)
NO (1) NO322295B1 (no)

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4114713B2 (ja) * 2001-11-30 2008-07-09 横浜ゴム株式会社 空気入りタイヤ
JP4056304B2 (ja) * 2002-06-24 2008-03-05 横浜ゴム株式会社 氷雪路用空気入りタイヤ
WO2005023564A1 (ja) * 2003-09-05 2005-03-17 Bridgest0Ne Corporation 空気入りタイヤ
JP4764085B2 (ja) * 2005-07-22 2011-08-31 株式会社ブリヂストン 空気入りタイヤ
US7779876B2 (en) * 2005-10-19 2010-08-24 Bridgestone Americas Tire Operations, Llc Reinforced blade for use in a vulcanization mold to form a sipe in a tire
JP4521829B2 (ja) * 2005-11-09 2010-08-11 東洋ゴム工業株式会社 空気入りタイヤ
JP4145337B2 (ja) * 2007-01-17 2008-09-03 横浜ゴム株式会社 空気入りタイヤ
US7950426B2 (en) * 2007-06-08 2011-05-31 Bridgestone Americas Tire Operations, Llc Tread blocks having reduced edge stiffness
JP4957786B2 (ja) * 2009-02-12 2012-06-20 横浜ゴム株式会社 空気入りタイヤ
JP5698622B2 (ja) * 2011-08-04 2015-04-08 株式会社ブリヂストン タイヤ
DE102013111471A1 (de) * 2013-10-17 2015-04-23 Continental Reifen Deutschland Gmbh Fahrzeugluftreifen
CA159352S (en) * 2014-05-15 2015-09-24 Hankook Tire Co Ltd Tire
CA159328S (en) * 2014-05-15 2015-09-21 Hankook Tire Co Ltd Tire
USD754058S1 (en) * 2014-12-18 2016-04-19 The Goodyear Tire & Rubber Company Tire
EP3274190B1 (en) * 2015-03-23 2021-05-05 Cooper Tire & Rubber Company Dual dome convex tire tread block or tread rib
JP6836382B2 (ja) * 2016-12-13 2021-03-03 Ｔｏｙｏ Ｔｉｒｅ株式会社 空気入りタイヤ
USD858425S1 (en) 2017-08-30 2019-09-03 Bridgestone Americas Tire Operations, Llc Tire
JPWO2022050287A1 (no) * 2020-09-03 2022-03-10
DE102020215798A1 (de) * 2020-12-14 2022-06-15 Continental Reifen Deutschland Gmbh Fahrzeugluftreifen
US20230191846A1 (en) * 2021-12-17 2023-06-22 The Goodyear Tire & Rubber Company Winter tire tread pattern
JP2024093504A (ja) * 2022-12-27 2024-07-09 住友ゴム工業株式会社 タイヤ
JP2024098861A (ja) * 2023-01-11 2024-07-24 住友ゴム工業株式会社 タイヤ

Family Cites Families (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB869980A (en) * 1958-06-20 1961-06-07 Us Rubber Co Improvements in slotted tyre tread
GB1265652A (no) * 1968-04-20 1972-03-01
DE2253717A1 (de) 1972-11-02 1974-05-09 Uniroyal Ag Fahrzeugluftreifen
DE2549668A1 (de) * 1975-11-05 1977-05-12 Uniroyal Ag Fahrzeugluftreifen mit radialkarkasse
FR2544251B1 (fr) 1983-04-12 1986-05-09 Michelin & Cie Elements en relief d'une bande de roulement pour pneumatique comportant des incisions a trace ondule ou brise
DE3540669A1 (de) 1985-11-16 1987-05-21 Continental Gummi Werke Ag Fahrzeugluftreifen
JPS63278807A (ja) * 1987-05-11 1988-11-16 Toyo Tire & Rubber Co Ltd タイヤ加硫成形用金型
US5176765A (en) * 1988-04-13 1993-01-05 Bridgestone Corporation Pneumatic tire having outer tread layer of foam rubber
JPH02175302A (ja) 1988-12-27 1990-07-06 Bridgestone Corp 空気入りタイヤ
JP3312784B2 (ja) * 1993-07-28 2002-08-12 株式会社ブリヂストン 空気入りタイヤ
JP3391538B2 (ja) 1994-02-02 2003-03-31 住友ゴム工業株式会社 スタッドレスタイヤ
DE69503575T2 (de) * 1994-06-21 1999-02-25 Bridgestone Corp., Tokio/Tokyo Luftreifen
JP3426386B2 (ja) * 1995-03-09 2003-07-14 株式会社ブリヂストン 氷雪走行に適した空気入りタイヤ
AT404339B (de) * 1995-11-24 1998-10-27 Semperit Ag Fahrzeugluftreifen
JPH08276709A (ja) 1995-12-11 1996-10-22 Koichi Nakazato タイヤ
EP0911187B1 (en) 1997-03-11 2004-08-18 Bridgestone Corporation Pneumatic tire
FI105903B (fi) 1997-05-26 2000-10-31 Nokian Renkaat Oy Ajoneuvon renkaan kulutuspinta ja lamelli pintamuodon aikaansaamiseksi
JP4272301B2 (ja) 1998-06-18 2009-06-03 住友ゴム工業株式会社 トレッドパタ−ン形成方法
US6382283B1 (en) * 1998-12-23 2002-05-07 Pirelli Pneumatici S.P.A. Tire for vehicle wheels including sipes
JP3912468B2 (ja) * 1999-04-12 2007-05-09 横浜ゴム株式会社 空気入りタイヤ
US6571844B1 (en) 1999-07-19 2003-06-03 Bridgestone Corporation Pneumatic tire having tread including pairs of sipes

Also Published As

Publication number Publication date
EP1157859A1 (en) 2001-11-28
NO20012504D0 (no) 2001-05-22
NO20012504L (no) 2001-11-26
ATE348717T1 (de) 2007-01-15
US20020007889A1 (en) 2002-01-24
FI115833B (fi) 2005-07-29
US6837285B2 (en) 2005-01-04
DE60125276D1 (de) 2007-02-01
JP2002002235A (ja) 2002-01-08
NO322295B1 (no) 2006-09-11
FI20001234A (fi) 2001-11-24
DE60125276T2 (de) 2007-04-05

Similar Documents

Publication Publication Date Title
EP1157859B1 (en) Tyre tread with blocks containing sipes
JP4519460B2 (ja) 切開が設けられたタイヤトレッド
JP3337415B2 (ja) 氷上走行に適した空気入りタイヤ
EP2072286A1 (en) Pneumatic tire tread and mold blade
CN104955660B (zh) 充气轮胎
EP1892126A1 (en) Pneumatic tire
EP0810104A1 (en) Treads for tires with siped elastomeric blocks
JPH07112603A (ja) 空気入りタイヤ
JP2002248906A (ja) ラジアルカーカスタイヤ用のトレッドパターン
CN108454325B (zh) 重载荷用充气轮胎
EP1034945A1 (en) Pneumatic tire
JPS63134312A (ja) 重荷重用空気入りラジアルタイヤ
US4258691A (en) Pneumatic tire having an improved uneven wear resistance
JP2002264611A (ja) 車両空気タイヤ
RU142144U1 (ru) Зимняя шина
CA1126141A (en) Large-sized pneumatic radial tires
JP3784907B2 (ja) 空気入りタイヤ
JPWO2005058617A1 (ja) 重荷重用空気入りタイヤ
US6604564B1 (en) Tread pattern motif for a tread
JPH05286313A (ja) 排水性能に秀れる、空気入りタイヤ
JP4291053B2 (ja) 空気入りタイヤ
JPH0825917A (ja) 方向性傾斜溝を有する氷雪上走行用空気入りタイヤ
JP4316284B2 (ja) 軌道走行車両用空気入りタイヤ
JP4414726B2 (ja) 空気入りタイヤ
JP3561287B2 (ja) 空気入りラジアルタイヤ

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

17P Request for examination filed

Effective date: 20020402

AKX Designation fees paid

Free format text: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20061220

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20061220

Ref country code: AT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20061220

Ref country code: BE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20061220

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20061220

Ref country code: LI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20061220

Ref country code: CH

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20061220

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20061220

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REF Corresponds to:

Ref document number: 60125276

Country of ref document: DE

Date of ref document: 20070201

Kind code of ref document: P

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20070320

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20070331

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20070423

NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

EN Fr: translation not filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20070921

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20070508

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070531

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20070810

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20070321

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070508

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070508

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20061220

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070508

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20061220

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20061220

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20200520

Year of fee payment: 20

REG Reference to a national code

Ref country code: DE

Ref legal event code: R071

Ref document number: 60125276

Country of ref document: DE